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Re: Button not showing on panel?

The problem is your Frame class. Frame "is-a" JFrame, so you don't need to create a new JFrame inside of it (you are making the same mistake in your panel class).
Instead, you want to do a super call. So, here is what your frame class should look like:

You need to make a similar change in your Panel class. Try to understand what I did, and apply it to your panel class. If you have trouble, feel free to ask me to clarify.

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